Syntaxerror unexpected token export jest react native. Dec 20, 2025 · In this blog, we’ll demystify why this error happens, explore common causes, and walk through actionable solutions to resolve it. config. Olek Posted on Dec 23, 2020 Jest SyntaxError: Unexpected token 'export' # jest # react # testing # rtl In this post, I'm not going to explain how to configure react-testing-library and Jest, there is a lot of useful information about it. I'm want to test a component in a React app using Jest Enzyme with TypeScript. it's not plain JavaScript. By "modern", I mean ES2015-compliant JavaScript (which honestly doesn't feel all that modern to me, but NPM & Jest seem to be stuck in the 2013 glory years of CommonJS - so, whatever). Because vitest does not export the Jest globals (like describe), you can either set globals: true, or manually import the required keywords in your test. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. Learn how to unit test Expo apps using Jest and React Native Testing Library, with solutions for mocking AsyncStorage, Redux, and React Navigation. Jest encountered an unexpected token Jest failed to parse a file. If your project uses TypeScript, Jest transforms your TypeScript files to JavaScript using the babel-jest transformer. This happens e. export and all those other aging conven Sep 15, 2024 · By default, Babel excludes Node modules from transformation. g. js. For a basic project, that's all that's needed. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". The Headache If you Google "jest unexpected token", there are several signs that this is a really nasty issue: There are a great many threads on the issue - on Stack Overflow and otherwise. This can be an issue if an ES Module-only package, such as react-markdown, is not pre-transpiled. Oct 19, 2025 · The SyntaxError: Unexpected Token 'export' error in Jest TypeScript projects can be a common roadblock, but by understanding the root causes and following the usage methods, common practices, and best practices outlined in this blog post, you can effectively resolve this issue. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. babelrc and some dependencies, moduleNameMapper and transformIgnorePatterns in jest. I follow the instructions on the Jest site, but for some reason I get: SyntaxError: Unexpected token < I can test Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. I have a problem to configure jest with react-native, when I install a third library I have SyntaxError with jest. May 29, 2024 · Description I am encountering an "Unexpected token 'export'" error when running Jest tests for a React Native project using React Native Testing Library. I can assure you that I was receiving the error "Jest gives an error: "SyntaxError: Unexpected token export"" and the above change worked to remove this error. I installed react-native-radio-buttons-group and I have this error: Details: Have you configured jest together with react-testing-library and now gotten Jest SyntaxError: Unexpected token 'export' when building? I tried multiple things, like modifying . Whether you’re using lodash-es, vue-esm, or another ESM package, this guide will help you get your tests running smoothly. This issue appears to be related to the transformation of ES6 module syntax in cert Jest : SyntaxError: Unexpected token export #38 Closed never00miss opened on Feb 17, 2020 · edited by never00miss ES Modules use the export syntax to export a module, while CommonJS uses the exports object. This time I'm going to talk about a specific error: SyntaxError: Unexpected token 'export'. I'm using jest to test a react TypeScript app. I refuse to write my packages with old-skool require() and module. This is the test I'm running: import { render, screen } from '@testing-library/react' import { toBeInTheDocument } from '@testing-library/jest-dom' i Problem solution for SyntaxError: Unexpected token export when running jest in react-native-picker Picker The problem being faced is related to the configuration of Jest, a popular JavaScript testing framework. Many of the threads are long. Jest uses Babel to compile JavaScript ES Modules to CommonJS, using the @babel/plugin-transform-modules-commonjs Babel plugin. Perhaps it was slower as you mention, but at least the tests worked. JEST - SyntaxError: Unexpected token 'export' with uuid library Asked 3 years, 6 months ago Modified 3 months ago Viewed 63k times. The threads span a number of years - meaning that the issue keeps cropping up for people repeatedly. I created an NPM package that uses modern JavaScript. A: To fix the syntax error “unexpected token ‘export'” in Jest, you will need to make sure that the variable or function that you are trying to export is declared in the current scope. qj0d4, xwj2xf, jhla1, 8knc, zlwkkk, jre6t, eqh8, 6q909, kxg8, y3zs1,